Hi drtungle,
Yeah, now that you mention it, there are not really many mellow tunes, but there are few less upbeat ones.
Take a look at:
Lost Village (pretty mellow)
Happy Land
Background – Underworld (ambient...although not soothing. Calm darkness)
Bite Lip (maybe ?)
Farewell (Grows fast and is upbeat, but has a sorrowish less techno-ey beat to it)
Pretty much all the other tunes I have ready for release (quite a few) are a little heavier, but i'll try and get some calmer ones out for those looking for that style, thanks for mentioning it.